CANON EF-M 9-18MM lens patent for mirrorless camera

Before we began we must know that an ultra wide-angle EF-M 11-22mm f/4-5.6 IS STM lens is already available for the EOS M system. Now Canon filed a latest patent for a 9-18mm f/3.5-4.5 STM, based on a new ultra wide angle optical formula. There is expectation that this latest patent for the STM lens will be the successor of the existing EF-M 11-22 f/4-4.5 IS STM lens.

Patent Details:-

Patent Publication No. 2016-54371 (Google Translated)

Published 2016.4.14

Filing date 2014.9.3

Zoom ratio 1.90

Wide-angle intermediate telephoto

Focal length 9.22 14.05 17.50

F-number 3.39 4.04 4.63

Half angle of view (degrees) 53.07 44.12 37.91

Image height 12.27 13.63 13.63

Overall length of the lens 89.68 83.60 86.84

BF 14.22 15.78 16.00

Upon correction of the distortion, providing a constraint on stretching amount at each image height